[taibanl]

Logic7 (SA688) /Harman Kardon (SA677) (Top Hifi) & EPS (Enhanced Premium Sound w/ DIRAC - from M3 and individual 3-series)

Technic's Explanation of MOST vs S/PDIF (TOSLINK) fiber optic connections

Mobridge DA-2 MOST to Digital Toslink or Analog Converter also here
Logic 7 Upgrade Questions (Add Sub and amp or start fresh?) Ed. note: this older thread has DIY info for wiring; recommend P&P harness instead.
Technic Harness for L7 + "Add-a-sub" install on L7 system

BMW Individual Audio / Enhanced Premium Sound
Bass Upgrade in M3 Sedan with EPS